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pwm in MCU added

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This commit is contained in:
Tristan Krause 2019-05-28 11:12:58 +02:00
parent 5f48849c4e
commit 1f53117577
7 changed files with 48 additions and 40 deletions
firmware
pwm.cpp

18
firmware/pwm.cpp Normal file
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#include "pwm.h"
void pwmSetFrequency(uint32_t freq)
{
TCCR0A = _BV(COM0B1) | _BV(WGM00) | _BV(WGM01);
DDRB |= _BV(PB4);
uint16_t p_ideal = ceil(float(F_CPU) / (freq * 0x100));
for(int8_t i = PWM_PRESCALER_COUNT - 1; i >= 0 && PWM_PRESCALERS[i] >= p_ideal; i--)
TCCR0B = _BV(WGM02) | i; // set prescaler
if(p_ideal)
OCR0A = (uint8_t) (float(F_CPU) / (freq * PWM_PRESCALERS[TCCR0B & 0x07]));
}
void pwmSetValue(uint8_t value)
{
OCR0B = value;
}